Prime and Composite Review

Front

What is a prime number?

Back

A prime number is a whole number greater than 1 that has exactly two distinct positive divisors: 1 and itself.

Front

What is a composite number?

Back

A composite number is a whole number greater than 1 that has more than two positive divisors.

Front

Is the number 1 prime or composite?

Back

Neither; 1 is not considered a prime or composite number.

Front

List the first five prime numbers.

Back

2, 3, 5, 7, 11.

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Front

Is the number 4 prime or composite?

Back

Composite; it has divisors 1, 2, and 4.

Front

Is the number 9 prime or composite?

Back

Composite; it has divisors 1, 3, and 9.

Front

What is the prime factorization of 18?

Back

2 x 3 x 3 or 2 x 3^2.

Front

Which of the following numbers is prime: 15, 17, 21?

Back

17 is prime; 15 and 21 are composite.

Front

How can you determine if a number is prime?

Back

A number is prime if it has no divisors other than 1 and itself.